▼ Menu

7591

 
    
Extras ▼

 

This exhibit is branded as being made by Hammond on the base cap with the Type designation and country of origin etched into the glass. The Hammond AO-14 M2 organ amplifier uses a pair of 7591 valves in the output stage.
We have data from Sylvania who describe the 7591 as a power output tube that is capable of 43 Watts of output at very low distortion when operated in push-pull and Class AB1. Or in Ultra linear configuration, an output of 32 Watts with a 400 Volt HT. RCA describe the 7591 as designed for high quality audio amplification.
The box anode - face view.
The Hammond AO-14 M2 amplifier. From an ebay listing.
The amplifier showing a 6SJ7 input stage.
The wide glass tube envelope is 28 mm in diameter, and excluding the IO base pins is 68 mm tall.
Reference: Datasheet. Type 7591 was first introduced in 1960.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
-
h
a
g2
k,g3
g1
h
g2

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
6.3
0.8
400
350
-20.5
80
11.5
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 10, 2017.
Return to Main Index